The amount of money you will spend on I/H/E, gear, and the venom (which is a pile of crap, btw) can buy you a cable b16 engine. Which means that for the price of a mount kit and assorted goodies, you'd have a b16 4th gen.
I'd really advise you to just save up.
If you really can't stand not to mod it a little, you could do suspension upgrades. None of those will go out the window when you swap.
I'd figure MAYBE 10 whp from those mods.